@article{10_4064_cm95_1_2,
     author = {S\'ebastien Blach\`ere},
     title = {Word distance on the discrete {Heisenberg} group},
     journal = {Colloquium Mathematicum},
     pages = {21--36},
     publisher = {mathdoc},
     volume = {95},
     number = {1},
     year = {2003},
     doi = {10.4064/cm95-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm95-1-2/}
}